CN111119072A - Staggered construction method for steps of high-pier bridge in mountainous area - Google Patents
Staggered construction method for steps of high-pier bridge in mountainous area Download PDFInfo
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- CN111119072A CN111119072A CN202010094626.9A CN202010094626A CN111119072A CN 111119072 A CN111119072 A CN 111119072A CN 202010094626 A CN202010094626 A CN 202010094626A CN 111119072 A CN111119072 A CN 111119072A
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- folded web
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- web plate
- hanging basket
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
Abstract
The invention discloses a staggered construction method for steps of a mountain high pier bridge, which comprises the following steps: step one, a hanging basket truss walks to N sections, and installation templates are used for binding N sections of bottom plate steel bars and N-1 sections of top plate steel bars; pouring concrete of the N-section bottom plate and the N-1 section top plate, and simultaneously carrying out installation construction on the N +1 section folded web plate by utilizing the hanging basket to hoist the folded web plate; and step three, the hanging basket truss walks to the N +1 sections, the N-1 sections are tensioned to form the prestress of the top plate, and the circulation of the next section is performed in sequence in a reciprocating mode. According to the construction method, 1 operation area is enlarged to 3 operation areas, 3 sections are independently and synchronously constructed, the working procedures are connected reasonably and are not interfered with each other, meanwhile, the hanging basket is used for carrying out installation and construction of the N +1 sections of the folded web plate by self-hoisting the folded web plate, the folded web plate of the valley high-pier bridge in the mountainous area is convenient to install and hoist, the limitation of the traditional construction method to a bridge construction site is overcome, the folded web plate is convenient to install, the construction cost can be saved, and the construction efficiency can be improved.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a staggered construction method for steps of a high-pier bridge in a mountainous area.
Background
With the continuous progress and development of bridge engineering in China, the folded steel web bridge is gradually popularized, and the construction method is gradually mature. In recent years, the traditional bridge construction method cannot meet the construction of a high pier folded web bridge in a mountainous area, for example, the maximum bridge height is 108 meters in a valley of the mountainous area where a certain bridge is located, and the construction of a cantilever folded web cannot be selected for self-hoisting of a tower crane and installation and construction of a crane. Therefore, bridge engineering personnel are required to research how to construct the high-pier web-folded bridge in the mountainous area so as to overcome the limitation of the traditional construction method to the bridge construction site, save the construction cost and improve the construction efficiency.
Disclosure of Invention
The invention aims to: aiming at the problem that the traditional bridge construction method cannot meet the construction problem of a mountainous area high pier web folding bridge, the construction method for the steps of the mountainous area high pier bridge is provided, the limitation of the traditional construction method to a bridge construction site can be overcome, the installation of a web folding plate is convenient, and meanwhile, the construction cost can be saved and the construction efficiency can be improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a staggered construction method for steps of a mountain high pier bridge comprises the following steps:
step one, a hanging basket truss walks to N sections, and installation templates are used for binding N sections of bottom plate steel bars and N-1 sections of top plate steel bars;
pouring concrete of the N-section bottom plate and the N-1 section top plate, and simultaneously carrying out installation construction on the N +1 section folded web plate by utilizing the hanging basket to hoist the folded web plate;
and step three, the hanging basket truss walks to the N +1 sections, the N-1 sections are tensioned to form the prestress of the top plate, and the circulation of the next section is performed in sequence in a reciprocating mode.
The construction method expands 1 operation area to 3 operation areas, 3 sections are independently and synchronously constructed, working procedures are reasonable in connection and are not interfered with each other, meanwhile, the hanging basket is used for carrying out installation and construction on the N +1 sections of the folded web plate by self-hoisting the folded web plate, the folded web plate of the valley high-pier bridge in the mountainous area is convenient to install and hoist, the limitation of the traditional construction method to a bridge construction site is overcome, the folded web plate is convenient to install, meanwhile, the construction cost can be saved, and the construction efficiency can be improved.
As a preferable scheme of the invention, the folded web plate installation construction comprises the following steps:
step one, arranging a gantry crane on a hanging basket truss, and arranging a rail trolley on a bridge floor;
hoisting the folded web plate to the bridge floor by adopting a tower crane, and then transporting the folded web plate to the lower part of the cantilever-end basket-hanging gantry crane by utilizing a small rail vehicle;
and step three, lifting the folded web plate through the gantry crane, enabling the gantry crane to travel along the track on the hanging basket truss, and then transporting to the installation position of the folded web plate at the end of the cantilever for butt joint.
The gantry crane is arranged on the cradle truss, the rail trolley is arranged on the bridge floor, the folded web plate is hoisted to the bridge floor by adopting a tower crane during construction of the folded web plate, then the folded web plate is transported to the lower part of the cradle gantry crane at the cantilever end by utilizing the rail trolley, and then the folded web plate is hoisted by the gantry crane and transported to the installation position of the folded web plate at the cantilever end for butt joint; because the tower crane is not only responsible for the installation of the web folding plate but also needs to hoist the steel bars and other materials in the conventional construction, the tower crane occupancy rate is very high, the working procedure time can also have a phenomenon of labor loss, and after the construction method is adopted, the web folding plate is installed without occupying the tower crane time, the tower crane only needs to hoist the web folding plate to the bridge floor to complete the task, the rest work is completed by the rail trolley and the hanging basket gantry crane, the construction method can be suitable for various construction sites, the web folding plate is mainly installed by the gantry crane on the hanging basket, and the web folding plate does not need to be installed by other auxiliary facilities, so the construction cost is greatly reduced, and the construction efficiency is improved.
As a preferable scheme of the invention, the gantry crane is arranged on a track beam of the basket hanging truss, and the track beam is arranged on two sides of the basket hanging truss along the bridge direction. The rail beams are arranged on the two sides of the cradle truss along the bridge direction, the gantry crane is installed on the rail beams, and when the rail small handlebar folded web plate is transported to the lower part of the cantilever end cradle gantry crane, the gantry crane lifts the folded web plate and transports the folded web plate to the installation position of the cantilever end folded web plate along the rail beams for butt joint installation.
As the preferable scheme of the invention, after the top plate of the last section of the standard section is poured after the construction is finished, the hanging basket truss on one side is retracted and detached, and the hanging basket truss on the other side is also used as a hanging basket of the closing section for closing.
As a preferable scheme of the invention, the gantry crane is a 5-8T gantry crane, and the travel is 15-18 meters.
As the preferable scheme of the invention, the track gauge of the gantry crane is larger than the transverse hoisting gauge of the folded web plate, so that the requirement of installing and hoisting the folded web plate is met.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the construction method expands 1 operation area to 3 operation areas, 3 sections are independently and synchronously constructed, the working procedures are connected reasonably and are not interfered with each other, meanwhile, the hanging basket is utilized to carry out the installation and construction of the N +1 sections of the folded web plate by self-hoisting the folded web plate, the folded web plate of the valley high pier bridge in the mountainous area is convenient to install and hoist, the limitation of the traditional construction method to the bridge construction site is overcome, the folded web plate is convenient to install, the construction cost can be saved, and the construction efficiency can be improved;
2. the gantry crane is arranged on the cradle truss, the rail trolley is arranged on the bridge floor, the folded web plate is hoisted to the bridge floor by adopting a tower crane during construction of the folded web plate, then the folded web plate is transported to the lower part of the cradle gantry crane at the cantilever end by utilizing the rail trolley, and then the folded web plate is hoisted by the gantry crane and transported to the installation position of the folded web plate at the cantilever end for butt joint; because the tower crane is not only responsible for the installation of the web folding plate but also needs to hoist the steel bars and other materials in the conventional construction, the tower crane occupancy rate is very high, the working procedure time can also have a phenomenon of labor loss, and after the construction method is adopted, the web folding plate is installed without occupying the tower crane time, the tower crane only needs to hoist the web folding plate to the bridge floor to complete the task, the rest work is completed by the rail trolley and the hanging basket gantry crane, the construction method can be suitable for various construction sites, the web folding plate is mainly installed by the gantry crane on the hanging basket, and the web folding plate does not need to be installed by other auxiliary facilities, so the construction cost is greatly reduced, and the construction efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of staggered construction of steps of a mountain high pier bridge.
Fig. 2 is a schematic longitudinal section of the construction of the hanging basket in the invention.
Fig. 3 is a schematic cross-sectional view of the construction of the hanging basket in the invention.
The labels in the figure are: the device comprises a truss 1, an anchoring system 2, a traveling mechanism 3, a suspension system 4, a top plate external mold I5, a top plate external mold II 6, an external mold sliding beam 7, a top plate internal mold 8, an internal mold sliding beam 9, a bottom mold 10, a track beam supporting leg 11, a walkway 12, a preformed hole 13, a track beam 14 and a gantry crane 15.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1 to 3, the staggered construction method for the steps of the mountain high pier bridge in the embodiment includes the following steps:
step one, a hanging basket truss walks to N sections, and installation templates are used for binding N sections of bottom plate steel bars and N-1 sections of top plate steel bars;
pouring concrete of the N-section bottom plate and the N-1 section top plate, and simultaneously carrying out installation construction on the N +1 section folded web plate by utilizing the hanging basket to hoist the folded web plate;
and step three, the hanging basket truss walks to the N +1 sections, the N-1 sections are tensioned to form the prestress of the top plate, and the circulation of the next section is performed in sequence in a reciprocating mode.
The construction method expands 1 operation area to 3 operation areas, 3 sections are independently and synchronously constructed, working procedures are reasonable in connection and are not interfered with each other, meanwhile, the hanging basket is used for carrying out installation and construction on the N +1 sections of the folded web plate by self-hoisting the folded web plate, the folded web plate of the valley high-pier bridge in the mountainous area is convenient to install and hoist, the limitation of the traditional construction method to a bridge construction site is overcome, the folded web plate is convenient to install, meanwhile, the construction cost can be saved, and the construction efficiency can be improved.
In this embodiment, the installation and construction of the folded web plate includes the following steps:
step one, arranging a gantry crane 15 on a hanging basket truss 1, and arranging a rail trolley on a bridge deck;
hoisting the folded web plate to the bridge floor by adopting a tower crane, and then transporting the folded web plate to the lower part of the cantilever-end basket-hanging gantry crane by utilizing a small rail vehicle;
and step three, hoisting the folded web plate through the gantry crane 15, enabling the gantry crane to travel along the track on the basket truss, and then transporting to the installation position of the folded web plate at the end of the cantilever for butt joint.
The gantry crane is arranged on the cradle truss, the rail trolley is arranged on the bridge floor, the folded web plate is hoisted to the bridge floor by adopting a tower crane during construction of the folded web plate, then the folded web plate is transported to the lower part of the cradle gantry crane at the cantilever end by utilizing the rail trolley, and then the folded web plate is hoisted by the gantry crane and transported to the installation position of the folded web plate at the cantilever end for butt joint; because the tower crane is not only responsible for the installation of the web folding plate but also needs to hoist the steel bars and other materials in the conventional construction, the tower crane occupancy rate is very high, the working procedure time can also have a phenomenon of labor loss, and after the construction method is adopted, the web folding plate is installed without occupying the tower crane time, the tower crane only needs to hoist the web folding plate to the bridge floor to complete the task, the rest work is completed by the rail trolley and the hanging basket gantry crane, the construction method can be suitable for various construction sites, the web folding plate is mainly installed by the gantry crane on the hanging basket, and the web folding plate does not need to be installed by other auxiliary facilities, so the construction cost is greatly reduced, and the construction efficiency is improved.
In this embodiment, the gantry crane 15 is installed on the track beam 14 of the cradle truss 1, and the track beam 14 is installed on two sides of the cradle truss 1 along the bridge direction. The rail beams are arranged on the two sides of the cradle truss along the bridge direction, the gantry crane is installed on the rail beams, and when the rail small handlebar folded web plate is transported to the lower part of the cantilever end cradle gantry crane, the gantry crane lifts the folded web plate and transports the folded web plate to the installation position of the cantilever end folded web plate along the rail beams for butt joint installation.
In this embodiment, after the last top plate of the standard segment is poured, the basket hanging truss on one side is retracted and removed, and the basket hanging truss on the other side is also used as a basket of the closed segment for closing.
In this embodiment, the gantry crane 15 is a 5T gantry crane, the travel of the gantry crane is 15.7 meters, and the track gauge of the gantry crane is 8.2 meters.
In this embodiment, the hanging basket includes a truss 1, an anchoring system 2, a traveling mechanism 3, a suspension system 4, a first top plate outer mold 5, a second top plate outer mold 6, an outer mold sliding beam 7, a top plate inner mold 8, an inner mold sliding beam 9, a bottom mold 10, a track beam leg 11, a walkway 12, a reserved hole 13, a track beam 14 and a gantry crane 15.
The folded web plate bridge of a certain project is positioned in a canyon, the maximum height difference is 108 meters, the existing domestic and foreign materials are studied in detail in order to select a construction method suitable for the bridge, and the following installation modes of the folded steel web plate for step staggered cantilever construction are summarized according to the materials and other construction methods similar to bridges: (1) directly hoisting a tower crane; (2) hoisting by a crane; (3) the bridge floor is provided with a rotary crane. The tower crane in the first scheme is directly hoisted, the type selection of the tower crane is inevitably large, and the cost is increased by nearly 10 ten thousand yuan per month; the second scheme is not applicable to the bridge position, and the conventional crane cannot meet the requirement because the pier column is as high as 85 meters, the maximum bridge is 108 meters and is also positioned in a valley; the third scheme is that the installation cost of the rotary crane is high, the number of the rotary cranes is nearly 45 thousands, and 8 rotary cranes are required to be installed on the bridge, so that the cost is high.
In the construction, the step staggered hanging basket is adopted for self-hoisting web folding construction, 1 operation area is expanded to 3 operation areas, 3 sections are independently and synchronously constructed, and the construction method is mainly different from conventional construction in that the conventional construction needs auxiliary hoisting of equipment such as a tower crane, an automobile crane and a bridge deck rotary crane according to different landforms and construction sites; the step dislocation hanging basket can be suitable for various construction sites by self-hoisting and web folding construction, the web folding plate is mainly installed by a gantry crane above the hanging basket truss, and the web folding plate does not need to be installed by other auxiliary facilities. This project bridge geographical position is more complicated, and the construction site is limited, and the cantilever of this bridge hangs the basket, adds on hanging the basket truss and establishes small-size gantry crane, hangs web by the gantry crane hoist and mount, and its main construction method is: the tower crane hoists the folded web plate to the bridge floor, then the folded web plate is transported to the lower part of the cantilever end hanging basket gantry crane by utilizing the rail small handle, the gantry crane is hoisted by the gantry crane, the gantry crane travels through the rail on the hanging basket truss, and then the gantry crane is transported to the installation position of the cantilever end folded web plate for installation. Hang basket, equipment analysis contrast as follows in this project construction:
comparative analysis by the table above: (1) compared with the scheme of step dislocation and gantry crane, the dead weight of the traditional conventional rhombic hanging basket exceeds 250 tons, and the cost is nearly 200 ten thousand, so that the cost is too high; (2) if step dislocation hanging baskets are adopted, although the hanging baskets have equal dead weights, the type requirement of the tower crane is high, the cost of each 70-30 tower cranes is about 4 ten thousand higher than that of 60-15 tower cranes per month, and the cost of 2 tower cranes is increased by about 140 ten thousand according to 18 months of construction period; (3) step dislocation hanging basket + gantry crane not only can reduce a grade on the tower crane lectotype, has obvious advantage in the dead weight moreover.
In folding web installation analysis, because of the rhombus string basket construction not step dislocation asynchronous pouring, so only contrast step dislocation construction and step dislocation string basket from hoist and mount roll web efficiency of construction: (1) the rhombic hanging basket is constructed in a segmental and integral manner in the construction process, and cannot be constructed in a subsection and subsection manner, so that the rhombic hanging basket is incomparable in time and working procedures; (2) in conventional step dislocation construction, the tower crane is not only in charge of installing the folded web plate but also in charge of hoisting reinforcing steel bars and other materials, the tower crane occupancy rate is high, and the working time can also have a work-nesting phenomenon, so that the superiority of subsection and subsection construction cannot be ensured; (3) the scheme construction of the step staggered hanging basket self-hoisting web folding plate (procedure: tower crane hoisting to bridge floor → rail trolley transportation → hanging basket hoisting → web folding plate butt joint), the hanging basket self-hoisting web folding plate construction, the tower crane installation will not occupy the tower crane time, the tower crane only needs to hoist the web folding plate to the bridge floor to complete the task, the rest of the working rail trolley and the hanging basket are completed, the smooth matching between the devices is reflected, the mutual interference is avoided, and the superiority of subsection construction is greatly improved. Through calculation and analysis, each segment can save 2 days.
The scheme of self-hoisting the folded web plate by adopting the step-staggered hanging basket can be seen from the aspects of hanging basket and equipment type selection, about 140 ten thousand can be saved at least in cost, and the two schemes are compared in the aspect of folded web plate installation time effectiveness, so that 2 days can be saved on each section by the hanging basket self-hoisting folded web plate, and the total construction period can be finished by nearly one month in advance. Therefore, the step dislocation hanging basket effectively reduces construction cost and cost, improves working efficiency, reduces investment of large equipment, is the optimal choice for the construction of the valley high pier web folding bridge in the mountainous area, and can also provide reference for similar web folding bridges in the future.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The staggered construction method for the steps of the high pier bridge in the mountainous area is characterized by comprising the following steps of:
step one, a hanging basket truss walks to N sections, and installation templates are used for binding N sections of bottom plate steel bars and N-1 sections of top plate steel bars;
pouring concrete of the N-section bottom plate and the N-1 section top plate, and simultaneously carrying out installation construction on the N +1 section folded web plate by utilizing the hanging basket to hoist the folded web plate;
and step three, the hanging basket truss walks to the N +1 sections, the N-1 sections are tensioned to form the prestress of the top plate, and the circulation of the next section is performed in sequence in a reciprocating mode.
2. The mountain area high pier bridge step dislocation construction method according to claim 1, wherein the folded web plate installation construction comprises the following steps:
step one, arranging a gantry crane on a hanging basket truss, and arranging a rail trolley on a bridge floor;
hoisting the folded web plate to the bridge floor by adopting a tower crane, and then transporting the folded web plate to the lower part of the cantilever-end basket-hanging gantry crane by utilizing a small rail vehicle;
and step three, lifting the folded web plate through the gantry crane, enabling the gantry crane to travel along the track on the hanging basket truss, and then transporting to the installation position of the folded web plate at the end of the cantilever for butt joint.
3. The mountain high pier bridge step dislocation construction method according to claim 2, wherein the gantry crane is mounted on a track beam of the cradle truss, and the track beam is arranged on two sides of the cradle truss along the bridge direction.
4. The mountain high pier bridge step dislocation construction method according to claim 1, wherein after the top plate of the last section of the standard section is poured, the hanging basket truss on one side is retracted and removed, and the hanging basket truss on the other side is used as a hanging basket of a closed section to be closed.
5. The mountain high pier bridge step dislocation construction method according to claim 2 or 3, wherein the gantry crane is a 5-8T gantry crane, and the stroke is 15-18 meters.
6. The mountain high pier bridge step dislocation construction method according to claim 5, wherein the track gauge of the gantry crane is larger than the transverse crane gauge of the folded web.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010094626.9A CN111119072A (en) | 2020-02-13 | 2020-02-13 | Staggered construction method for steps of high-pier bridge in mountainous area |
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| CN202010094626.9A CN111119072A (en) | 2020-02-13 | 2020-02-13 | Staggered construction method for steps of high-pier bridge in mountainous area |
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| CN113174867A (en) * | 2021-05-14 | 2021-07-27 | 山东润宇模板有限公司 | Rapid construction method and system for top and bottom plate separation partition |
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| CN113174867A (en) * | 2021-05-14 | 2021-07-27 | 山东润宇模板有限公司 | Rapid construction method and system for top and bottom plate separation partition |
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Application publication date: 20200508 |